| Citation: | ZHAO Minwei, TIAN Peisen, HUANG Xinbo, et al. Numerical simulation study on the dynamics of bluff-body flames under oxygen-lean conditions[J]. Journal of Aerospace Power, 2025, 40（9）：20230661 doi: 10.13224/j.cnki.jasp.20230661
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To investigate the effect of oxygen content on the dynamic combustion characteristics of an afterburner, a large eddy simulation method was used to study the effects of oxygen content (14%—23%) at different pressures (0.1—0.3 MPa) on the flow field structure, flame morphology, exothermic pulsation, and pressure pulsation of the afterburner. Research showed that the oxygen content at different pressures had a significant impact on the flame and flow field behind the bluff body flame holder; as the pressure and oxygen content changed, two different instability characteristics, BVK and KH, were observed in the shear layer. The flow downstream of the combustor was mainly dominated by BVK instability; as the oxygen content decreased, the flame oscillation amplitude increased, the concentration of OH groups in the combustor decreased, and the flame temperature decreased; in addition, changes in oxygen content and pressure also affected the location of KH instability transitioning to BVK instability; under the dominance of BVK instability, the dominant frequency of pressure pulsation and exothermic pulsation was consistent, while under the dominance of KH instability, exothermic pulsation had no obvious dominant frequency.
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